Analysis and modeling of peak-current-mode controlled buck converter in DICM

T. Suntio

Research output: Contribution to journalReview Articlepeer-review

41 Citations (Scopus)


This paper presents a unified method to obtain both small- and large-signal models for a peak-current-mode-controlled buck converter which accurately predict its behavior. The models show that the peak-current-mode transfer functions are effectively of first order, as can be expected due to the heavy bounding of inductor current. The large-signal behavior can be accurately predicted by using a simple algebraic equation including the mode limit of basic-switching-frequency operation as well as the input-output relations. It is also pointed out that a buck converter can have stable open-loop as well as closed-loop operation modes at basic switching frequency and at its even and odd harmonics. The subharmonic modes are, however, not controllable in a conventional way.
Original languageEnglish
Pages (from-to)127-135
Number of pages9
JournalIEEE Transactions on Industrial Electronics
Issue number1
Publication statusPublished - 2001
Externally publishedYes
Publication typeA2 Review article in a scientific journal


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